冻结土壤、水水平换热管耦合传热分析
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国家自然科学基金项目(50804021)


Analysis of coupled heat transfer between freezing soil,water and horizontal heat exchange tube
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    摘要:

    以冻结土壤、水-水平换热管之间耦合传热作用为研究对象,对冻结条件下非饱和土壤连续性方程和热量迁移方程,采用有限容积数值方法进行离散求解,给出了部分温度场、冻结率分布图,并分析了耦合传热原因。分析结果表明:冻结土壤温度场是大致与地表平行的水平线,固液相变区高峰值发生在有回水管的上部,低值发生在无水平换热管的地方,水平换热管使冻结锋面向地表方向偏移,水平换热管进回水位置布置方式不同影响冻结土壤相变区域的大小与位置,回水管在单侧和中间布置是较优的布置方式。

    Abstract:

    The research object is the coupled heat transfer effect between freezing soil,water and horizontal heat exchange tube,use finite volume numerical method to dispersed solving for continuity equation and heat transfer equation of unsaturated freezing soil,gives part of the temperature fields and freezing percentage distribution graphs,and analyzes the reason of the coupled heat transfer.The analysis result shows that:the temperature field of freezing soil are some horizontal lines parallelling to the ground surface.The peak value of solid-liquid phase change region appears in the upper part where there is backwater pipe,the low value appears in the place where there isn't horizontal heat exchange tube.The horizontal heat exchange tube makes the freezing front deviate towards the ground surface.The arrangement difference of inlet and outlet position of horizontal heat exchange tube will effect the size and position of the phase change region of freezing soil.Arranging the backwater pipe at one side or middle position is the optimized mode.

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杨伟,薛思浩,杨秋实,康凯,张树光.冻结土壤、水水平换热管耦合传热分析[J].土木与环境工程学报(中英文),2012,34(Z1):120-123.

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  • 在线发布日期: 2012-09-13
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